Welcome to patrons, please rest assured to choose products. If you have any questions, please contact us in time via email, we will answer you within 24 hours.Speed-no load: 20000rpmWorking pressure: 90psiCollet size: 3.15mm, 6.35mmIntake interface: 1/4BSPAverage air consumption: 4cfmPackage Contents:1* grinding machine2* wrench2* chuck4* scouring pad1* 2 inch trayOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.